D. The U.S. believed that Iraq possessed weapons of mass destruction.
Explanation:
This was the official statement of President Bush. A PBS article states, “Americans were told by President Bush and his administration that the U.S. was going to war with Iraq because of the imminent threat of Saddam's weapons of mass destruction and ties to terrorism.” Saddam Hussein, the President of Iraq at the time, had the capability of creating weapons of mass destruction and already possessed them after the Gulf War.
